Fix warning

rivers/input/keyboard/omap-keypad.c: In function
'omap_kp_probe':
drivers/input/keyboard/omap-keypad.c:450: warning: 'row_idx'
is used uninitialized in this function
drivers/input/keyboard/omap-keypad.c:453: warning: 'col_idx'
is used uninitialized in this function

Signed-off-by: Dirk Behme <dirk.behme_at_gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>